When I first saw this white mould on an Agaricus sp., I assumed I was dealing with a Cladobotryum. However, after examining the microscopy from a colony grown on PDA and Sabouraud, I'm no longer convinced.

The colony was mostly gelatinous (about 2?cm after 5 days), with the gel composed of a dense suspension of conidiospores. At the margins and on the surface, however, there were some velutinous, dry hyphae.

Under the microscope, I observed aseptate to rarely septate conidia of variable lengths, along with hyphal fragments that seem to originate from a very fragile microfungus. These might be phialides broken off from the conidiophore, but the spores still do not match typical Cladobotryum morphology. Perhaps this is due to the mycelium being taken from an artificially grown colony? There is C. varium, which may offer such morphology but not seeing an obvious verticillia, now I dont know what I have here. 

Conidia staib better in Cotton blue than COngo Red and they have 2-4 dark bodies (genetic material).